Pressure control valve device



May 5, 1953 A. J. BENT I 2,637,340/

PRESSURE CONTROL VALVE DEVICE Original Filed July 22, 1947 INVENTOR. ARTHUR J. BENT BY ZzJZ /AJ ATTOR N EY Patented May 5, 1953 PRESSURE CONTROL VALVE DEVECE Arthur J. Bent, Penn Township, Pa., assignor to Westinghouse Air Brake Company, a corporation of Pennsylvania Original application July 22, 1M7, Serial No.

762,771, now Patent No. 2,608,052, dated August 26, 1952.

Divided and this application June 15, 1948, Serial No. 33,045

1 Claim. 1

This invention relates to pressure control valve devices of the type arranged to provide, from a source of fluid at highly fluctuating pressure, a substantially constant mean of the fluctuating pressure for control purposes, the present invention being a division of my copending application, Serial No. 762,771, filed July 22, 1947, now Patent No. 2,608,052 issued August 26, 1952.

More specifically, in the copending application relating to control apparatus for a free piston gas generator, an operators control device is arranged to regulate the amount of air in a bounce chamber of the generator in which charm her the pressure of the air fluctuates between extreme limits during operation of the generator. It is desirable to employ a mean of this fluctuating pressure as a cntro1 pressure in the operators control device and the principal obiect of the invention is the provision of improved means for accomplishing this result.

Other objects and advantages will become apparent from the following more detailed description of the invention.

In the accompanying drawing the single figure is a sectional view of a pressure control valve device embodying the invention.

As shown in the drawing, the pressure control valve device comprises a casing having a chamber l containing a check valve 2 arranged to cooperate with a seat 3 for closing communication from a passage 4 in the casing to a passage 8 in the casing. The passage 4 is open to chamber I and also to a control pipe 9 in which it is desired to hold a substantially constant pressure. The passage 5 is connected to a pipe 1 in which pressure of fluid is adapted to fluctuate. A bias spring 8 in chamber 1 acts on check valve 2 for urging it to its seat.

A choke valve 9 adjustably mounted in the casing cooperates with an opening 10 in the casing to provide a restricted communication by-passing the check valve 2 and thereby connecting chamber l with passage 5. The casing also has a restricted or choked communication H connecting passage 4 to atmosphere.

In operation, when the pressure of fluctuating fluid in pipe I and passage 5 exceeds the pressure of fluid in chamber 1 and passage 4, the check valve 2 will be unseated by the higher pressure to permit flow of fluid under pressure from passage 5 past said check valve to chamber l and passage 4, and when of a lesser degree the check valve 2 will be closed by spring 8 to prevent reverse flow of fluid under pressure past it. Under the latter condition fluid under pressure will, however, flow from chamber l and passage 4 to passage 5 and pipe 7 past the choke valve 9 at a rate determined by the adjustment of said valve. Thus as the pressure of fluid in pipe 7 and passage 5 fluctuates there will alternately be a flow of fluid under pressure to pipe 6 and a restricted release of fluid under pressure therefrom, with th result, that a substantially constant mean of the fluctuating pressure in pipe '1 will be maintained in pipe 5. Another reason for choke valve 9 is to permit the mean pressure in pipe 5 to increase or decrease, as the case may be, in accordance with an adjusted change of the range of pressure fluctuations in pipe I.

The choked communication H provides for a constant restricted flow of fluid under pressure from passage l to atmosphere for the purpose of blowing from said passage any dirt or foreign matter which otherwise might tend to flow along with fluid from said passage to choke valve 53 and tend to clog the passage around said valve.

It is desired to point out that the choke communication l I could, if desired, embody the function of choke valve 9 in which case said valve and the by-pass communication With which said. valve cooperates could be dispensed with.

Having now described the invention, what I claim as new and desire to secure by Letters Patent, is:

A control structure for providing in a casing outlet passage a mean of a fluctuating pressure in a casing inlet passage open to said outlet passage, a check valve in said casing for permitting flow of fluid under pressure in the direction from said inlet passage to said outlet passage but arranged to prevent reverse flow of such fluid under pressure, a constantly open restricted communication in said casing connecting said outlet passage to said inlet passage around said check valve, and a restricted atmospheric vent in said casing open to said outlet passage.

ARTHUR J. BENT.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,239,929 Mecham Sept. 11, 1917 1,377,878 French Mar. 10, 192. 1,509,508 Grunwald Sept. 23, 1924 1,801,407 Barks -1 Apr. 21, 1931 1,853,329 Austin Apr. 12, 1932 1,909,469 Hubbard May 16, 1933 1,923,127 Veenschoten Aug. 22, 1933 2,214,290 Ward Sept. 10, 1940 2,273,118 Langdon Feb. 17, 1942 2,417,217 Schreck Mar. 11, 194.7 2,475,783 Gibbo July 17, 19 i9 

